| OCR Text |
Show South. However, generally the residential properties unless the concentrations level. in lead of include not does is adjacent to or property flood Iplain, or alluvial ans the soil exceed the action inherently part of the channel, and action 'The action requires the removal of soil containing lead at concentrations greater than 2,000 mg/Xg or to depths generally not to exceed 3 feet in the channel and placing an adeqpate cover areas to over contaminated prevent exposure' and continued migration of contaminated soil.. The channel wil be regraded with clean fill from either the banks of the channel or from an off-site borrow source. Specific elements of the response action are described in more detail below. . A. Channel Area: The response action calls for removing soil containing lead concentrations greater than 2,000 mg/Kg from the channel, and placing an adequate cover over contaminated The channel will be regraded areas to prevent exposure. with clean fill from ,either the banks of the.channel or from an off-site source. 1. Soil removal depths will channel in the and on conditions contaminant deEth; generally, the removal depth will not exceed three feet, except in linlited areas where of deep deposits may be effectively pockets zemoved The lateral extent of' soil removal will generally be limited to the channel banks and with l.ead· flood, undeveloped plain concentrations in excess of 2,000 mg/Kg. depend , . . 2. Channel grade and contours will be restored, ,and soil fill wil,l have sufficient clay content to normal to due prevent erosion, runoff flow and 100 year flood events.in the channel. Restoration of the channel must be based on appropriate designs f.or. open cel flow. 3.' Vegetation will to be restore necessary stabilize the channel 4 Culverts, or other re-established where the and landscape .• spillways, rip-rap, stilling basins systems necessary. 4 will be installed as |
